I'm making an original, from scratch character and a couple of conforming costumes that go along with him. The left shoulder (lShldr) of these conforming costumes is causing me some trouble. It goes all wacky, but only at certain poses. The left side of these conforming figures are cut exactly like the right side, the JPs are mirrored, so they are the same on the left as they are on the right...but the problem does not happen on the right side. And the more I bend the lCollar, the more room I have to bend the lShldr before it goes wacky on me.

It's very strange, and I was wondering if anyone has run into this before. I am using a phantom neck (which I think I have set-up properly), and maybe that has something to do with it.

Anyone have any ideas?